New here, looking for a diagnosis!

Hi all

This is my first time here so apologies if I do this wrong.

I'm mid 40s and have always suffered from anxiety/depression and am now seeing similarities between symptoms of autism and myself. Is the only way of getting a diagnosis through your GP? I'm quite paranoid and I think my GP thinks I'm a hypochondriac so I hate the thought of having to go to her, I'm sure she'll just think I'm attention seeking or making it up.